group-by combo-box display value

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In a databound GridGroupingControl one of the columns has a Combo-box cell type. The combo-box has a value member (ID) and a display member (Name). At runtime when the user drags the combo-box column to the group area, the data is grouped by the (ID). What I need is to group by the combo-box display value (Name) instead of grouping by the combo-box's selected value (ID)?